[1] In 1990, Jääskinen was appointed as head of the European Law Section of the Ministry of Justice in Finland.
In 1995 he was appointed as Advisor and Clerk for European affairs of the Grand Committee of the Finnish Parliament.
[2] In 2009, he was appointed Advocate General of the European Court of Justice and in 2019 for the remaining two years of judge Allan Rosas' mandate.
In 2014, he gave his opinion on Google Spain v AEPD and Mario Costeja González.
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